Attachment for telephones.



- 7 I. w. NILS SON. ATTACHMENT FOR TELEPHONES; APPLIOATIUE TILED H07. 16, 1909.

Patented Oct. 11,1910.

J. W. NILSSON. ATTACHMENT FOB TELEPHONES APPLICATION FILED NOV. 18, 1909.

Patnted Oct. 11, 1910,

V I 3 SHEETS-$111312! 2.

QXMJnemca I John m Nilason i To all unimn it may concern:

for 'lelephoneaz.

Eitl

:OHN XV.

ZLTQQ'ACHMENT FOR TELEPHONES.

, tie it known that I, Join VF. NH. (1. zen of the United iulil'. ll

and useful lmprovemerfl, in Attachments and I do hereby declare the following o l: a full; elear, and exact Zeseription of the invention. such as will enahle others skilled in theart. to which it apperlains to make and use the same.

This invention relates to telephone circuits.

and more especially to a device for detecting a third party on a telephone circuit.

More particularlv the invention ;s an attaehment for telel 'ihones. The principal o eet of the invention is to provide an audible signalwhich will indieate to a person using any one of the telephones in a. party line System the presence of an auditor at another telephone of that system.

Another object of the invention is to indicate to a person using: any one of. the telephone? in a party line Systen'i the numherof the telephone :mmvering his eall. thereby -'i\ irg information as to what telephone has responded to the call.

A third objevt of the invention is to provide means whereby the removal of the re-' ceher from its fork will actuate a signal, the means being so arranged that it is impossible. to tamper withthe fork false signal.

\Yitli the. above and other objects in view,

the invention. consists in general of an attachment for telephones arranged to give a signal when the receiver is removed from its fort; said atta'rlunent being n'ovided with means to prevent the simulation of the nal of one telephone by the signaling mechanism ofanother.

The invention further ronsi ts in rertain novel deta'.. of consirwaiou and eonihinations of nuts. liereinai'nr t de erihetn illustrate: in the. t-f('i.*liii1itl* y and 'peszit ieallv set forth in th In the avmnipan ing drawi aeters of referenee indicate like m in the several vicar. and F EIHIT is a from elexalink; of an an .1 to: !.Ql;'} hu1lv$ Cltlr stz-u-zul in ;-.-1tln5*c(* with this invention of the. devil-t: ljtlllf interior.

SSQXya Qtates. residingat Balti wcounly of Mellenry, State of North Dakota, have invented certain new and give a h'awings,

I Specification of Letters Patent. Patented Olii. 1 Application filed November 16, 1908. Serial No. 528.314.

IJILSSOE", C-F BALI-OUR. NORTH DAKOTA.

a detail section on the line 4-1 of Fig. 1. Fig. 5 is an enlarged detail view of the guard plate. Fig. (3 is an enlarged detail erspeetive. of the hell ,aetuatiug frame. dig. 7 is an enlarged detail showing the arrmra'ement of one of the hanm'iers.

The devir'e. has here heen shown as applied to an ordilazry telephone of the type such as is indicated by the. letter A. This telephone is equipped with the usual transmitter B and receiver all of these parts being of the ordinaland well known forms. Within the telephone asing is mounted the usual recei er fork 11 which is pivoted to a bracket. as indicated at 12. This receiver fork is provided with a contact block 13 which serves to close the usual line contacts 14. A apting 15 is mounted in the telephone casing beneath the receiver fork and serves to raise the fork when the re- PATENT OFFICE.

wall or box oeived is removed therefrom, the strength of the eprin being so proportioned that the weight 01 the fork added to the weight of the receiver will permit the spring to he depressed. Upon the fork 11 there is provided a clip haviir; a pair of upstanding ears 16 through which passes a bolt 17 so that the devicenmy be attached to any ordinary fork. This clip isfurther provided with laterally extending cars 15 and 19. Attached to the clip is a plate 20 provided with a series of ratchet teeth 21 and this plate is the slot wherein the receiver forltoperates.

Attached below the slot is a guide '22 for said i plate. and this guide is provided with an opening 523 which exposes a portion of the toothed edge of the plate. Adjacent this owning is mounted a Spring pawl 2i. the pawl being: so positioned that the end thereof may drop into the opening and engage the ratehet I'L'tlli of the plate. l'ivoled adjaeentthe guide is an arm 25 having a projecting perforated ear 2 This arm is so arranged that when raised it pree es against the end of the pawl'zind forces the .-.ame out of engagement with the ratchet teeth while when depressed it permits the paw to engage the ratehet teeth.

At 27 is a cylinder wherein moves a piston having a rod 29 extending downward therefrom. At the upper end of this cylinder there is provided a valve. opening 30 "wherein is seated a valve 31 attached to an j arm whieh pivoted to a lmi -lcet carried on the upper endof the. cylinder and to of Slu'll' dimensions as to completely cover.

neath the end of the lever 44 adjacent the bell actuatingframe. T his arm is normally urged outward to this engaging position by shaft freed from restraint so that the latch end swings out underneath the lever 4-1. I'Vhen the receiver fork is raised it carries up with it the trip bar and at the upper end of its n'iovement the trip bar strikes the arm (on the shaft and moves the latch arm in.

By this means when the receiver fork .ms completed its upward movement the lever 44 released from restraint and the weight 46 pulls the frame downward. thus actuating the signal. Itwill he observed that by ineansof this mechanism. the entire signal is rung every timethe receiver is removed from its fork and that until the signal is com: pleted the receiver cannot be again depressed. It. is thus impossible to so actuate the receiver fork as to cause an incorrect. nal to be given. There has thus been provided a simple and elllcicnt device of the kind descrihcd and for the purpose specified. It is ohvious thatminor changes mavhe made in the form and construction of this invention-without departing from the material principlesthcreof. It is not therefore desire to confine the invention to the exact. form herein sho n and described, but it is wished to include all such as properly come within the scope of the appended claims.

Having thus described the invention, what. is claimed as new, is: 1. In a device of the kind described, a signaling mechanism, a receiver fork, means said means operating to set said mechanism upon the depression of the fork, elements arranged to prevent a. second depression of the fork until the signaling mechanism has completed its ope 'ation, and other elements ar ranged to hold the signaling mechanism from operation until the receiver fork oompletcs its upward movement.

3. In a device of the kind described, a signaling mechanism, a receiver fork, an oper-' ating lever l'or said signaling mechanism, a

clip on said receiver fork having an opening tl'ieretlnongh. a rod connected tosaid lever and slidahle through the opening in the clip, a nut on said rod below the opening in the clip. said lever, clip and fund forming means to set the signaling mechanism upon the de nession of the fork. and elements arram ed to prevent a second dcpresion of the fork until the signaling mechanism has completed its operation. 4. Ina device of the kinddescrihcd, a'sigpaling mechanism. areceiver fork. an operating lever for said signaling mechanism, a clip on said receiver fork having an opening therethrongh. a rod connected to said. lever and slidahle through the opening in the clip, anut on said rod helouithe'opening in the clip, said lever; clip and rod forming nccans to set. the signaling mechanism upon the deprcssioii of the fork, etc-aunts arranged to prevent a second depression of the fork until the signaling meclnu'nsm has completed its operation, and other elements arranged to hold the signaling nu-chanism from operation until the receiver fork completes its up ward movement.

signaling mechanism, a receiver fork, an operating lever for said signaling mechanism, a clip on said receiver fork hav'ng an opening theret-hrough, a rod connected to said lever and slidahle through the opening in the clip, a nut on said rod below the open ing in the clip, said lever, clip and rod forming means to set the signaling mechanism upon the depression of the fork, a

ratchet carried by said clip, a pawl mounted adjacentthe ratchet and engageahle therewith, a swinging arm pivoted adjacent the pawl and rovided vith an opening thr ugh which sair rod passes, said arm oeiixg arranged toengagc beneath the par-vi and raise the same as the arm is raised and to free ranged to raise the arm as the lever reaches the completion of its signaling movement.

6. In a device of the kind described, a signaling mechanism, a receiver fork, an operating lever for said signaling mechanism, a 1p on said receiver fork havizv an opening rherethrough, a rod connected to said lever and slidahle through the opening in the clip, a out on said rod below the opening in the clip, said lever, clip and rod forming means to set the signaling mecha- In a device of the kind described, a

nism upon the depression of the fork, a

ratchet carried by said clip, a pawl mounted adjacent the ratchet and engageable therewith, a. swinging arm pivoted adjacent the of said stops arm as the fork reaches the lower endof its movement, and the lower of said stops being arranged to raise the arm as the lever opening treaches the completion of its signaling movement, and elements arranged to hold the signaling mechanism from operation until the receiver fork nicnt.

7. In a. device of the kinddoscribed, a signaling mechanism, a receiver fork, an operatin lever for said signaling mechanism, aci on said receiver fork havin an l i erethrongh, a rod connecte to said lever, and slidable through the opening completes its upward movein the clip, a nut on saidrod below the opening in the clip, said lever, clipand rod formingnicans to set the signaling mechanism upon the depressi n of the fork, a

ratchet carried by said clip, a pawl mounted" adjacent the. ratchet and engageable there with, a swingin arn': pii'oted adjacent the pawl and rovi ed with anopenin through which 581 rod passes, said arm eing arranged to en agc beneath the pawl and raise the same as the arm is raised and to free said pawl as the arm is depressed, spaced stops on said rod opposite sides of the opening through the arm, the upper of said stops being arranged to depress the arm as the fork reaches the lowereud of its movement, and the lower of said stons being arranged to raise the arm as the lever reaches the completion of its signaling movement, and ele-' ments arranged to hold the signaling mechanism from operation until the receiver fork completes its upw ard movement, said elements comprising a shaft adjacent said lever, an arm on said shaft. ada ted releasably to engage saidlevcr and hold movement when thesignaling mechanism is set and tlie'fork depressed, a trip bar carried by said fork, a second arm on said shaft having anend movable into the path of the i trip bar when the fork is depressed and the lever locked, said second arm being engaged bythe trip bar when the fork reaches the upper end of its movement whereby the shaft is rotated and the lever unlocked, and

a sprin normally urging the locking arm outwart V p 7 8. In a device of the kind described, a slidin frame, a series of pins carried by said frame, a bell, a hammer lev'er'pivoted the same against adjacent said frame, a short shaft whereon said lever is pivoted, a second lever mounted on said shaft and having anrarm prcqectlng cover the frame to beengaged by the pins as the frame is moved, a spring normall; holdariu projecting over the upper part of the spring prcssc whereby the second lever may be moved in one direction without. affecting the first lover.

In testimony whereof, I ailix my signature, in presence of two witnesses.

JOHN W. vILs-soit Witnesses: I

S. L. Knnvn, G. J. W101i.

arm of the second lever mg the second lever horizontal, an formed on the first lever, and a lng on said 

